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evilo
Joined: 22 Apr 2004
Posts: 230
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 Posted: Wed Jul 14, 2004 7:19 pm Post subject: 64 bits aligned |
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HI all,
may be it will be a stupid question for you, but on my side I still don't know exactly in which cases buffers need to be 64 bits aligned...
And what are the side effects on non aligned buffers ?
I searched the forum, look at a few sources, and this is not always the case !!
Thank you :)
evilo |
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blackdroid
Joined: 17 Jan 2004
Posts: 564
Location: Sweden
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| Posted: Wed Jul 14, 2004 8:33 pm Post subject: |
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64 bits is not enough. 128bits ( 16 bytes ) alignment is needed for all dma transfers.
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evilo
Joined: 22 Apr 2004
Posts: 230
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| Posted: Wed Jul 14, 2004 9:33 pm Post subject: |
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Ok,
but without speaking of dma transfert ?
is it needed for buffers declarations ? |
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blackdroid
Joined: 17 Jan 2004
Posts: 564
Location: Sweden
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| Posted: Wed Jul 14, 2004 9:52 pm Post subject: |
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without dma ( first off, nearly anything you do on this machine is for dma'ing ) you only need to care about alignment for the datawidth you are using, and that is more for performance. so if you are going to read int's float's align to 4 bytes.
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